gymnastics, 60d or 7d?

I'm just getting started and have read discussions, reviews etc. about cameras and gymnastics photography, but have no practice or experience. I'm looking at getting the 60d or 7d, for gymnastic pictures (fast action and poor light) but would also use for all family pictures. The kids are young so plan to have the camera for a long time. I realize much is dependent on the lenses especially for gymnastics, are there any strong recommendations for one over the other?